Erectile dysfunction

My SO has been experiencing a weak erection for over a year now. He is able to get a partial erection, but can't maintain it or obtain full. I believe he has/had peyronies to begin with, but we've been treating that with mega doses of serrapeptase for the last 3 months or more and we don't feel anything hard and plaquey anymore. He is diabetic and just recently found out that he has a thyroid condition. He is also 62. He is not overweight. His erection feels kind of odd, though, like there are valleys at different parts of his penis. He is also having difficulty connecting to 'feeling' or 'excitement' when he does get a partial erection. He's also a vegetarian. He's been taking Vitamin A with large doses of L-Arginine and a supplement calle Rise II. He's also been a vegetarian since 1976. Any suggestions. Thanks. Tweet